Bit



April 21, 1942. P, ANT RQS. I 2,280,295

BIT

Filed Aug. 3, 1940 s snets-sneet 2 INVENTO ATTORNEY Patented Apr. 21,1942 BIT Paul Manteros, Nashua, N. H. Application August 3, 1940, SerialNo. 351,029 3 Claims. (01. 144--233) The general object of the inventionis'to provide a bit having attached blades; and which is adaptable toreceive blades of a greatvariety of form, size, and order ofdispositions on the bit, depending upon the character of the Work to bedone.

The invention can best be seen and understood by reference to thedrawings in which- Fig. lshows the complete bit in side elevation.

Fig. 2 is a plan.

Fig. 3 is the same as Fig. 1 but with the parts disassembled.

Fig. 4 is aside element of the bit fitted with long blades, as willlater be referred to.

Fig. 5is a side elevation of the bit fitted with l short blades.

Fig. 6 is a side elevation of the body of the bit with spindle removedand fitted with a set of blades.

Fig. 7 is a side elevation of the body of the bit fitted with blades setdifferently than as shown in Fig. 6.

Fig. 8 is a plan of the bit as shown in Fig. '7.

Fig. 9 is a perspective of one of the blades of Fig. 5. I

Fig. 10 shows in side elevation a modification of the invention with theparts disassembled.

I and entering a socket II at the centre of the Fig. 11 is a sideelevation the same as in Fig. 10,

with the parts assembled.

Fig. 121 is a view mainly in vertical cross section of the bit shown inFig. 10-; and

Fig. 13 is the same as Fig. 10 except that it shows a different typecutting blade.

I represents the body of the bit. This body is generally disc-shaped andof appreciable diam; star and thickness. Projecting from its under side,preferably integrally connected, isea shank unit (not shown) forpurposes of rotation.

The top side of the body I is crossed diametrically by a deep bladereceiving incision 3. It has, also, other blade receiving incisions 3parallelly arranged and in staggered relation to each other, andpreferably entering the body with inclination, as at any acute angle.Blades set into the incisions are held in place by set screws 4 whichenter threaded sockets 5 in the body I and engage the embedded portionof each of the blades at substantially right angle to it.

Rising from the body I is a stepped spindle 6. At its lower end thisspindle is provided with an annular flange 1 which is fixedly secured tothe body I by screws 8 after centering by a pin 9 projectingdownwardly'from the centre of the flange I 2 by which the bit is securedto any suitable motor.

body I.

Above its attaching flange I the spindle presents a bottom step I Igenerally tubular in form and presenting a plain cylindrical outersurface. Rising from the step II is a step I2 generally tubularin formwith diameter less than the step I I, and presenting a threaded outersurface. At its top end the step I2 has a plain conical end I3 fromwhich rises the third step I4 generally tubular in form of less diameterthan the step I2 and with threaded outer surface. The spindle thusstepped is preferably made from a single solid piece of metal.

By means of cuts extending radially through the flange 1 of the spindleand rising vertically along the sides of its steps II and I2 bladereceiving incisions I5 are formed thereon. These blade receivingincisions lie diametrically opposed to one another entering fromopposite sides of the flange 1 and the spindle and are coincident withthe blade receiving incision 3 in the body I. Thus blades set into theincisions I5 of the flange I and spindle will lie along their lower edgeportions within the incision 3 in the body I, and

accordingly will be held in by the set screws 4 which hold all bladesentering this incision.

The blades thus set into the body of the bit and spindle are also heldin place by pressure appliedfrom above to the top ends of the blades,but this depends upon the length of the blades for blades of differentlengthsmay be employed.

Shorter blades applied to the body and spindle rise above the step IIand onto. the step I2 (see Fig. 5), but not above the threads on thisstep. These blades are held down from above by a tubular sleeve I6threaded intothe step I2. This sleeve when tightened exerts strongpressure on the top ends of the short blades thereby assisting inholding them in place. the sleeve IGismade scalloped to facilitate itsturning. I

Longer blades applied to the body of the bit and spindle (see Fig. 4)rise above the step I2 and onto the step I4. These blades are held downby a sleeve I8 applied to the threaded surface of the step I4 and havinga squared head I9 by which it may be turned.

Thus the bit is made adaptable for receiving a great variety of bladesboth in size, form, and relative disposition on the bit, depending uponthe work to be done.

When the bit is used without the spindle, as it may be used, blades a,a, 0rd, a are placed Within the incision 3, or within the incisions 3The top edge I1 of within the body I, as shown in Figs. 6 and 7. Theseblades are especially adapted for doing sinkage work, such as rosettes,panellings, groovings, or the like.

When the bit is used with the spindle applied to the body, as shown inFigs. 4 and 5, then blades b, or b are applied to the bit, brepresenting the shorter blades and b the longer blades. These bladesare fixedly secured in place as previously explained.

The blades applied to the combined body and spindle are especiallyadaptable for lateral or edge cutting as in the making of mouldings andthe like. During this cutting the work rests upon a table and is appliedto the cutting blades in the usual manner. As the bit follows along theside or edge of the work for obtaining a cutting therein this edge alongwhich the bit is working will, when the shorter blades are employed,bear against the sleeve I 6 and, when the longer blades are employed,against the sleeve l8. These sleeves against which the work is bearingare rotating at a very high speed and are susceptible to excessive wearowing to continued bearing of the work against them. They are made,however, of a material much harder than that of the body of the bit orspindle so as to withstand the wear. In this connection it will beobserved that the sleeves l6 and I8 perform a double function inasmuchas they act not only to assist in holding the blades in place but alsopresent bearing surfaces along which the work may follow.

The blades themselves are made from fiat stock which permits ofconvenience and economy in their making, and sharpening. They are madein a great variety of forms, the particular blades to be used, and theirdisposition on the bit, varying with the work to be done.

For certain types of work it is desirable that the work engage bearingsurfaces above and below the cutting blade. Accordingly, in Figs. 10 to13, inclusive, modification is shown in order that this end may besecured. Here the spindle is provided with a blade receiving incisionand arranged upon the spindle are rings 2|. The blade c lies betweensets of these rings and is embedded in part within the incision in thespindle. The part of the blade thus embedded is provided at oppositeends with outstanding flanges 22 which lie in back of the adjacentrings. Rings and blade are then held bound together by the sleeve-likenut in the threaded portion of the spindle which, when tightened againstthe ring adjacent to it, acts to bind rings and blade together and holdthe blade securely in place.

I claim:

1. A bit having a body attachable for rotation, a stepped spindleconnected thereto and rising therefrom, said spindle comprising a lowerstep and an upper step, said upper step being of lesser diameter thanthe lower step and having a threaded external surface, said body andspindle being provided with a blade receiving incision by which acontained blade will lie embedded in part Within said body and in partwithin said spindle with extension onto the threaded portion of theupper step thereof, means for holding a blade thus embedded in placeincluding a member borne by said body adapted and arranged to exert,lateral pressure against that portion of the blade embedded within saidbody, and a member on the threaded step of said spindle adapted andarranged when tightened to have engagement with the top end portion ofsaid blade.

2. A bit having a body attachable for rotation, a stepped spindleconnected to said body, said spindle comprising a lower step and stepsrising therefrom gradually lessening in diameter and each presenting athreaded external surface, said body and spindle being provided with ablade receiving incision by which a contained blade will lie embedded inpart within said body and in part within said spindle with extensiononto some threaded step of said spindle depending upon the length of theblade, means for holding a blade thus embedded in place including amember borne by said body adapted and arranged to exert lateral pressureagainst that portion of the blade embedded within said body, and membersarranged on the respective threaded steps of said spindle each adaptedand arranged when tightened to have selective bearing engagement withthe top end portion of the blade extending onto its threads.

3. A bit having a body attachable for rotation and having therein ablade receiving incision Within which a cutting blade will lie embedded,a stepped spindle comprising a flanged lower step and steps risingtherefrom gradually lessening in diameter and each presenting a threadedexternal surface, said spindle being provided with a blade receivingincision cut through said flange with extension along said steps of thespindle and onto the uppermost threaded step thereof, means for securingsaid spindle to said body whereby the incision in the flange and spindlewill lie coincident with the incision in said body in continuationthereof, means for holding a blade embedded within the incisions of saidbody and spindle including a member borne by said body adapted andarranged to exert lateral pressure against that portion of the bladeembedded within said body, and members arranged on the respectivethreaded steps of said spindle each adapted and arranged when tightenedto have selective bearing engagement with the top end. portion of theblade extending onto its threads.

PAUL MANTEROS.

